I will recommend to find and experienced sound engineer, and take a few lessons here. It's not just turning some knobs take the signal to subs from a aux send. It really requires a huge effort to really understand what is going on.

Well I am one of those guys who likes to do a separate subwoofer feed.

Running a separate subwoofer feed is a recognised PA technique - especially suited to using large numbers of mics.
Given the OP's equipment and the simple needs of a 4 piece band I do not think that a separate subwoofer feed is necessary, or appropriate, especially for someone who is just starting to learn how to set up and use their new PA system.
Regards
Xoc 1

If I may... you've spent good money on a new system, finish the purchase by hiring someone to set it up for you. In my local market it would cost $300 - $500 for a full day (up to 10 hours) to have someone bring out SMAART, take detailed measurements, set your eq, crossovers, time delays, gain staging and give some basic instructions on how to best use the tools you have. The driverack settings can be locked down unlike knobs on older gear which can be changed by anyone. The advice you'll get will save time and give better results on every show.
Cheers,